The 20 photographs of the week

The most compelling photojournalism of the week came from the protests on the streets of Ukraine, Brazil and Santiago. Here, the security forces of the interior ministry guard a trade union building in Odessa, Ukraine. At least 42 people were killed in street battles between supporters and opponents of Russia which culminated with pro-Russia protesters trapped in a flaming building Photograph: Gleb Garanich/Reuters

A pro-Russia supporter breaks a window at the offices of Industrial Union of Donbass Corporation in Donetsk. According to reports, masked pro-Russia supporters stormed the regional office of the Ukrainian intelligence service shouting: 'We will not forgive Odessa' Photograph: Maysun/EPA

In Mariupol, Ukraine, a police station is ablaze as fighting between supporters and opponents of Russia left several people dead Photograph: Evgeniy Maloletka/AP

Local residents carry portraits of their ancestors, participants in the second world war, as they celebrate Victory Day in St Petersburg, Russia. About 30,000 people walked in a march named 'immortal regiment' to mark the 69th anniversary of the defeat of Nazi Germany Photograph: Dmitry Lovetsky/AP

In this photograph by Ben Curtis, South Africans protest against the abduction of hundreds of schoolgirls in Nigeria by the Islamist extremist group Boko Haram and the failure of the Nigerian government and international community to rescue them Photograph: Ben Curtis/AP

Oscar Pistorius greets his brother Carl in court in Pretoria. Pistorius is on trial for murdering his girlfriend Reeva Steenkamp at his Pretoria home on Valentine's Day last year Photograph: Ihsaan Haffejee/Pool/EPA

A supporter of South Africa's Economic Freedom Fighters during the final electoral campaign rally in Atteridgeville Photograph: Marco Longari/AFP

Manchester City's Stevan Jovetic celebrates after scoring a goal against Aston Villa. After the 4-0 victory against Villa, City needed just a point from the last game of the season against West Ham to win the league title Photograph: Phil Noble/Reuters

City only need a point because Liverpool could only draw at Crystal Palace after conceding three late goals. In this photograph by Tom Jenkins, a regular contributor to this gallery, Steven Gerrard consoles Luis Suárez just after the final whistle at Selhurst Park Photograph: Tom Jenkins/Guardian

Steam rises from a thoroughbred racehorse after the morning workouts on the day of the 140th Kentucky Derby at Churchill Downs in Louisville, Kentucky Photograph: Luke Sharrett/Bloomberg/Getty

Debris rises in what Free Syrian Army fighters and Islamist rebels said was an operation to strike an al-Sahaba checkpoint and remove forces loyal to Syria's President Bashar al-Assad in Maarat al-Nouman, Syria Photograph: Rasem Ghareeb/Reuters

An aerial perspective by Rahmat Gul shows the full extent of the landslide that buried the village of Abi Barik in Afghanistan Photograph: Rahmat Gul/AP

A man looks at a lone house at a construction site in Fikirtepe, Istanbul. An urban regeneration project is at a standstill as the owner of the house refuses to give his approval for its demolition Photograph: Bulent Kilic/AFP

Suspected al-Shabab militants wait to be taken off for interrogation during a joint night operation between the Somali security services and the African Union force, Amisom, in Mogadishu, Somalia Photograph: Tobin Jones/EPA

Protesters prepare to throw petrol bombs at police during violent clashes in Santiago, Chile. Thousands of students demanded the education reforms that President Michelle Bachelet had promised when elected Photograph: Luis Hidalgo/AP

In another photograph from the protests in Chile, students clash with riot police as they increased the pressure on President Michelle Bachelet to fulfil her campaign pledges to overhaul education in the country Photograph: Ivan Alvarado/Reuters

Barack Obama is photographed through a destroyed car during a tour of tornado-damaged areas in Vilonia, Arkansas Photograph: Brendan Smialowski/AFP

In this photograph by Nacho Doce, a member of Brazil's Homeless Workers' Movement sleeps in his newly built shack at the 'People's World Cup' camp, which houses an estimated 2,800 families near São Paulo's World Cup stadium Photograph: Nacho Doce/Reuters

In Seoul, South Korean students display yellow ribbons symbolising their hope for the safe return of the missing passengers from the sunken ferry Sewol Photograph: Jeon Heon-Kyun/EPA

And finally to Bulgaria where men compete in a traditional wrestling tournament, part of a holiday marking the circumcision of young boys in the village of Draginovo Photograph: Nikolay Doychinov/AFP